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Ti-Al Alloys Prepared by Ball Milling and Hot Isostatic Pressing

Published online by Cambridge University Press:  01 January 1992

M. Oehring ,
T. Klassen  and
R. Bormann
M. Oehring
Affiliation:
GKSS-Research Center, Institute for Materials Research, Max-Planck-Str., D-2054 Geesthacht, Germany
T. Klassen
Affiliation:
GKSS-Research Center, Institute for Materials Research, Max-Planck-Str., D-2054 Geesthacht, Germany
R. Bormann
Affiliation:
GKSS-Research Center, Institute for Materials Research, Max-Planck-Str., D-2054 Geesthacht, Germany
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Abstract

For the powder metallurgical production of Ti-Al alloys, elemental powder blends and prealloyed powders were mechanically alloyed in a planetary ball mill. Thereby metastable solid solutions or amorphous phases are formed depending on the overall composition and the milling conditions. The crystalline phases exhibit an extremely small crystallite size of about 10 - 30 nm. This favors the consolidation of the powders which was performed by hot isostatic pressing in the temperature range between 500 °C and 800 °C. The results show that fully dense Ti-48 at.% Al alloys can be obtained only for a temperature of 800 °C. The crystallite sizes increase during compaction, but remain below about 0.15 µm. This allows the preparation of test specimens to investigate the mechanical properties of Ti-Al alloys with submicron crystallite sizes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 873
Copyright
Copyright © Materials Research Society 1995

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References

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